530 lines
18 KiB
C
530 lines
18 KiB
C
/*
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* general implementation of scanf used by scanf, sscanf, fscanf,
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* _cscanf, wscanf, swscanf and fwscanf
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*
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* Copyright 1996,1998 Marcus Meissner
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* Copyright 1996 Jukka Iivonen
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* Copyright 1997,2000, 2003 Uwe Bonnes
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* Copyright 2000 Jon Griffiths
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* Copyright 2002 Daniel Gudbjartsson
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifdef WIDE_SCANF
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#define _CHAR_ MSVCRT_wchar_t
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#define _EOF_ MSVCRT_WEOF
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#define _EOF_RET MSVCRT_WEOF
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#define _ISSPACE_(c) MSVCRT_iswspace(c)
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#define _ISDIGIT_(c) MSVCRT_iswdigit(c)
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#define _WIDE2SUPPORTED_(c) c /* No conversion needed (wide to wide) */
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#define _CHAR2SUPPORTED_(c) c /* FIXME: convert char to wide char */
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#define _CHAR2DIGIT_(c, base) wchar2digit((c), (base))
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#define _BITMAPSIZE_ 256*256
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#else /* WIDE_SCANF */
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#define _CHAR_ char
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#define _EOF_ MSVCRT_EOF
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#define _EOF_RET MSVCRT_EOF
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#define _ISSPACE_(c) isspace(c)
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#define _ISDIGIT_(c) isdigit(c)
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#define _WIDE2SUPPORTED_(c) c /* FIXME: convert wide char to char */
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#define _CHAR2SUPPORTED_(c) c /* No conversion needed (char to char) */
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#define _CHAR2DIGIT_(c, base) char2digit((c), (base))
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#define _BITMAPSIZE_ 256
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#endif /* WIDE_SCANF */
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#ifdef CONSOLE
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#define _GETC_(file) (consumed++, _getch())
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#define _UNGETC_(nch, file) do { _ungetch(nch); consumed--; } while(0)
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#define _FUNCTION_ static int MSVCRT_vcscanf(const char *format, va_list ap)
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#else
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#ifdef STRING
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#undef _EOF_
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#define _EOF_ 0
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#define _GETC_(file) (consumed++, *file++)
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#define _UNGETC_(nch, file) do { file--; consumed--; } while(0)
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#ifdef WIDE_SCANF
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#define _FUNCTION_ static int MSVCRT_vswscanf(const MSVCRT_wchar_t *file, const MSVCRT_wchar_t *format, va_list ap)
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#else /* WIDE_SCANF */
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#define _FUNCTION_ static int MSVCRT_vsscanf(const char *file, const char *format, va_list ap)
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#endif /* WIDE_SCANF */
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#else /* STRING */
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#ifdef WIDE_SCANF
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#define _GETC_(file) (consumed++, MSVCRT_fgetwc(file))
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#define _UNGETC_(nch, file) do { MSVCRT_ungetwc(nch, file); consumed--; } while(0)
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#define _FUNCTION_ static int MSVCRT_vfwscanf(MSVCRT_FILE* file, const MSVCRT_wchar_t *format, va_list ap)
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#else /* WIDE_SCANF */
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#define _GETC_(file) (consumed++, MSVCRT_fgetc(file))
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#define _UNGETC_(nch, file) do { MSVCRT_ungetc(nch, file); consumed--; } while(0)
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#define _FUNCTION_ static int MSVCRT_vfscanf(MSVCRT_FILE* file, const char *format, va_list ap)
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#endif /* WIDE_SCANF */
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#endif /* STRING */
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#endif /* CONSOLE */
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/*********************************************************************
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* Implemented based on
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* http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccore98/html/_crt_format_specification_fields_.2d_.scanf_and_wscanf_functions.asp
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* Extended by C. Scott Ananian <cananian@alumni.princeton.edu> to handle
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* more types of format spec.
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*/
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_FUNCTION_ {
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int rd = 0, consumed = 0;
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int nch;
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if (!*format) return 0;
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#ifndef WIDE_SCANF
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#ifdef CONSOLE
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TRACE("(%s): \n", debugstr_a(format));
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#else /* CONSOLE */
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#ifdef STRING
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TRACE("%s (%s)\n", file, debugstr_a(format));
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#else /* STRING */
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TRACE("%p (%s)\n", file, debugstr_a(format));
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#endif /* STRING */
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#endif /* CONSOLE */
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#endif /* WIDE_SCANF */
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nch = _GETC_(file);
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if (nch == _EOF_) return _EOF_RET;
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while (*format) {
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/* a whitespace character in the format string causes scanf to read,
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* but not store, all consecutive white-space characters in the input
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* up to the next non-white-space character. One white space character
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* in the input matches any number (including zero) and combination of
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* white-space characters in the input. */
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if (_ISSPACE_(*format)) {
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/* skip whitespace */
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while ((nch!=_EOF_) && _ISSPACE_(nch))
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nch = _GETC_(file);
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}
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/* a format specification causes scanf to read and convert characters
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* in the input into values of a specified type. The value is assigned
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* to an argument in the argument list. Format specifications have
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* the form %[*][width][{h | l | I64 | L}]type */
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else if (*format == '%') {
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int st = 0; int suppress = 0; int width = 0;
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int base, number_signed;
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int h_prefix = 0;
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int l_prefix = 0;
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int L_prefix = 0;
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int w_prefix = 0;
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int prefix_finished = 0;
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int I64_prefix = 0;
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format++;
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/* look for leading asterisk, which means 'suppress assignment of
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* this field'. */
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if (*format=='*') {
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format++;
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suppress=1;
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}
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/* look for width specification */
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while (_ISDIGIT_(*format)) {
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width*=10;
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width+=*format++ - '0';
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}
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if (width==0) width=-1; /* no width spec seen */
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/* read prefix (if any) */
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while (!prefix_finished) {
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switch(*format) {
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case 'h': h_prefix = 1; break;
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case 'l': l_prefix = 1; break;
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case 'w': w_prefix = 1; break;
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case 'L': L_prefix = 1; break;
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case 'I':
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if (*(format + 1) == '6' &&
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*(format + 2) == '4') {
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I64_prefix = 1;
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format += 2;
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}
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break;
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default:
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prefix_finished = 1;
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}
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if (!prefix_finished) format++;
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}
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/* read type */
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switch(*format) {
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case 'x':
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case 'X': /* hexadecimal integer. */
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base = 16; number_signed = 0;
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goto number;
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case 'o': /* octal integer */
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base = 8; number_signed = 0;
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goto number;
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case 'u': /* unsigned decimal integer */
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base = 10; number_signed = 0;
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goto number;
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case 'd': /* signed decimal integer */
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base = 10; number_signed = 1;
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goto number;
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case 'i': /* generic integer */
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base = 10; number_signed = 1;
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number: {
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/* read an integer */
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ULONGLONG cur = 0;
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int negative = 0;
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int seendigit=0;
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/* skip initial whitespace */
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while ((nch!=_EOF_) && _ISSPACE_(nch))
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nch = _GETC_(file);
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/* get sign */
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if (number_signed && (nch == '-' ||
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nch == '+')) {
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negative = (nch=='-');
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nch = _GETC_(file);
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if (width>0) width--;
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}
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/* look for leading indication of base */
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if (width!=0 && nch == '0') {
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nch = _GETC_(file);
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if (width>0) width--;
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seendigit=1;
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if (width!=0 && (nch=='x' || nch=='X')) {
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if (base==0)
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base=16;
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if (base==16) {
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nch = _GETC_(file);
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if (width>0) width--;
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seendigit=0;
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}
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} else if (base==0)
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base = 8;
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}
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/* throw away leading zeros */
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while (width!=0 && nch=='0') {
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nch = _GETC_(file);
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if (width>0) width--;
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seendigit=1;
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}
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if (width!=0 && _CHAR2DIGIT_(nch, base)!=-1) {
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cur = _CHAR2DIGIT_(nch, base);
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nch = _GETC_(file);
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if (width>0) width--;
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seendigit=1;
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}
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/* read until no more digits */
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while (width!=0 && (nch!=_EOF_) && _CHAR2DIGIT_(nch, base)!=-1) {
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cur = cur*base + _CHAR2DIGIT_(nch, base);
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nch = _GETC_(file);
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if (width>0) width--;
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seendigit=1;
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}
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/* okay, done! */
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if (!seendigit) break; /* not a valid number */
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st = 1;
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if (!suppress) {
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#define _SET_NUMBER_(type) *va_arg(ap, type*) = negative ? -cur : cur
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if (number_signed) {
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if (I64_prefix) _SET_NUMBER_(LONGLONG);
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else if (l_prefix) _SET_NUMBER_(long int);
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else if (h_prefix) _SET_NUMBER_(short int);
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else _SET_NUMBER_(int);
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} else {
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if (negative) {
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WARN("Dropping sign in reading a negative number into an unsigned value");
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negative = 0;
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}
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if (I64_prefix) _SET_NUMBER_(ULONGLONG);
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else if (l_prefix) _SET_NUMBER_(unsigned long int);
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else if (h_prefix)
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_SET_NUMBER_(unsigned short int);
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else _SET_NUMBER_(unsigned int);
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}
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}
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}
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break;
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case 'e':
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case 'E':
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case 'f':
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case 'g':
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case 'G': { /* read a float */
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long double cur = 0;
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int negative = 0;
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/* skip initial whitespace */
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while ((nch!=_EOF_) && _ISSPACE_(nch))
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nch = _GETC_(file);
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/* get sign. */
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if (nch == '-' || nch == '+') {
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negative = (nch=='-');
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if (width>0) width--;
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if (width==0) break;
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nch = _GETC_(file);
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}
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/* get first digit. */
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if (!_ISDIGIT_(nch)) break;
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cur = (nch - '0');
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nch = _GETC_(file);
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if (width>0) width--;
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/* read until no more digits */
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while (width!=0 && (nch!=_EOF_) && _ISDIGIT_(nch)) {
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cur = cur*10 + (nch - '0');
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nch = _GETC_(file);
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if (width>0) width--;
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}
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/* handle decimals */
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if (width!=0 && nch == '.') {
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float dec = 1;
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nch = _GETC_(file);
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if (width>0) width--;
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while (width!=0 && (nch!=_EOF_) && _ISDIGIT_(nch)) {
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dec /= 10;
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cur += dec * (nch - '0');
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nch = _GETC_(file);
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if (width>0) width--;
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}
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}
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/* handle exponent */
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if (width!=0 && (nch == 'e' || nch == 'E')) {
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int exponent = 0, negexp = 0;
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float expcnt;
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nch = _GETC_(file);
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if (width>0) width--;
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/* possible sign on the exponent */
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if (width!=0 && (nch=='+' || nch=='-')) {
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negexp = (nch=='-');
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nch = _GETC_(file);
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if (width>0) width--;
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}
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/* exponent digits */
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while (width!=0 && (nch!=_EOF_) && _ISDIGIT_(nch)) {
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exponent *= 10;
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exponent += (nch - '0');
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nch = _GETC_(file);
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if (width>0) width--;
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}
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/* update 'cur' with this exponent. */
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expcnt = negexp ? .1 : 10;
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while (exponent!=0) {
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if (exponent&1)
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cur*=expcnt;
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exponent/=2;
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expcnt=expcnt*expcnt;
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}
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}
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st = 1;
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if (!suppress) {
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if (L_prefix) _SET_NUMBER_(long double);
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else if (l_prefix) _SET_NUMBER_(double);
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else _SET_NUMBER_(float);
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}
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}
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break;
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/* According to
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* http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vclib/html/_crt_scanf_type_field_characters.asp
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* 's' reads a character string in a call to fscanf
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* and 'S' a wide character string and vice versa in a
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* call to fwscanf. The 'h', 'w' and 'l' prefixes override
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* this behaviour. 'h' forces reading char * but 'l' and 'w'
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* force reading WCHAR. */
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case 's':
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if (w_prefix || l_prefix) goto widecharstring;
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else if (h_prefix) goto charstring;
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#ifdef WIDE_SCANF
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else goto widecharstring;
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#else /* WIDE_SCANF */
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else goto charstring;
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#endif /* WIDE_SCANF */
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case 'S':
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if (w_prefix || l_prefix) goto widecharstring;
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else if (h_prefix) goto charstring;
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#ifdef WIDE_SCANF
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else goto charstring;
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#else /* WIDE_SCANF */
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else goto widecharstring;
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#endif /* WIDE_SCANF */
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charstring: { /* read a word into a char */
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char*str = suppress ? NULL : va_arg(ap, char*);
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char*sptr = str;
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/* skip initial whitespace */
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while ((nch!=_EOF_) && _ISSPACE_(nch))
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nch = _GETC_(file);
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/* read until whitespace */
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while (width!=0 && (nch!=_EOF_) && !_ISSPACE_(nch)) {
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if (!suppress) *sptr++ = _CHAR2SUPPORTED_(nch);
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st++;
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nch = _GETC_(file);
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if (width>0) width--;
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}
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/* terminate */
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if (!suppress) *sptr = 0;
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}
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break;
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widecharstring: { /* read a word into a wchar_t* */
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MSVCRT_wchar_t*str =
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suppress ? NULL : va_arg(ap, MSVCRT_wchar_t*);
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MSVCRT_wchar_t*sptr = str;
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/* skip initial whitespace */
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while ((nch!=_EOF_) && _ISSPACE_(nch))
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nch = _GETC_(file);
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/* read until whitespace */
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while (width!=0 && (nch!=_EOF_) && !_ISSPACE_(nch)) {
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if (!suppress) *sptr++ = _WIDE2SUPPORTED_(nch);
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st++;
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nch = _GETC_(file);
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if (width>0) width--;
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}
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/* terminate */
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if (!suppress) *sptr = 0;
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}
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break;
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/* 'c' and 'C work analogously to 's' and 'S' as described
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* above */
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case 'c':
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if (w_prefix || l_prefix) goto widecharacter;
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else if (h_prefix) goto character;
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#ifdef WIDE_SCANF
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else goto widecharacter;
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#else /* WIDE_SCANF */
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else goto character;
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#endif /* WIDE_SCANF */
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case 'C':
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if (w_prefix || l_prefix) goto widecharacter;
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else if (h_prefix) goto character;
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#ifdef WIDE_SCANF
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else goto character;
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#else /* WIDE_SCANF */
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else goto widecharacter;
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#endif /* WIDE_SCANF */
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character: { /* read single character into char */
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if (!suppress) {
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char*c = va_arg(ap, char*);
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*c = _CHAR2SUPPORTED_(nch);
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}
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st = 1;
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nch = _GETC_(file);
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}
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break;
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widecharacter: {
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if (!suppress) { /* read single character into a wchar_t */
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MSVCRT_wchar_t*c = va_arg(ap, MSVCRT_wchar_t*);
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*c = _WIDE2SUPPORTED_(nch);
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}
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nch = _GETC_(file);
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st = 1;
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}
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break;
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case 'n': {
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if (!suppress) {
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int*n = va_arg(ap, int*);
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*n = consumed - (nch!=_EOF_);
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}
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}
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break;
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case '[': {
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_CHAR_ *str = suppress ? NULL : va_arg(ap, _CHAR_*);
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_CHAR_ *sptr = str;
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RTL_BITMAP bitMask;
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LPBYTE Mask;
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int invert = 0; /* Set if we are NOT to find the chars */
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/* Init our bitmap */
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Mask = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, _BITMAPSIZE_/8);
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RtlInitializeBitMap(&bitMask, Mask, _BITMAPSIZE_);
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/* Read the format */
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format++;
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if(*format == '^') {
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invert = 1;
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format++;
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}
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if(*format == ']') {
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RtlSetBits(&bitMask, ']', 1);
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format++;
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}
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while(*format && (*format != ']')) {
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/* According to:
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* http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccore98/html/_crt_scanf_width_specification.asp
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* "Note that %[a-z] and %[z-a] are interpreted as equivalent to %[abcde...z]." */
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if((*format == '-') && (*(format + 1) != ']')) {
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if ((*(format - 1)) < *(format + 1))
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RtlSetBits(&bitMask, *(format - 1) +1 , *(format + 1) - *(format - 1));
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else
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RtlSetBits(&bitMask, *(format + 1) , *(format - 1) - *(format + 1));
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format++;
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} else
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RtlSetBits(&bitMask, *format, 1);
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format++;
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}
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/* read until char is not suitable */
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while ((width != 0) && (nch != _EOF_)) {
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if(!invert) {
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if(RtlAreBitsSet(&bitMask, nch, 1)) {
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if (!suppress) *sptr++ = _CHAR2SUPPORTED_(nch);
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} else
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break;
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} else {
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if(RtlAreBitsClear(&bitMask, nch, 1)) {
|
|
if (!suppress) *sptr++ = _CHAR2SUPPORTED_(nch);
|
|
} else
|
|
break;
|
|
}
|
|
st++;
|
|
nch = _GETC_(file);
|
|
if (width>0) width--;
|
|
}
|
|
/* terminate */
|
|
if (!suppress) *sptr = 0;
|
|
HeapFree(GetProcessHeap(), 0, Mask);
|
|
}
|
|
break;
|
|
default:
|
|
/* From spec: "if a percent sign is followed by a character
|
|
* that has no meaning as a format-control character, that
|
|
* character and the following characters are treated as
|
|
* an ordinary sequence of characters, that is, a sequence
|
|
* of characters that must match the input. For example,
|
|
* to specify that a percent-sign character is to be input,
|
|
* use %%." */
|
|
while ((nch!=_EOF_) && _ISSPACE_(nch))
|
|
nch = _GETC_(file);
|
|
if (nch==*format) {
|
|
suppress = 1; /* whoops no field to be read */
|
|
st = 1; /* but we got what we expected */
|
|
nch = _GETC_(file);
|
|
}
|
|
break;
|
|
}
|
|
if (st && !suppress) rd++;
|
|
else if (!st) break;
|
|
}
|
|
/* a non-white-space character causes scanf to read, but not store,
|
|
* a matching non-white-space character. */
|
|
else {
|
|
/* check for character match */
|
|
if (nch == *format) {
|
|
nch = _GETC_(file);
|
|
} else break;
|
|
}
|
|
format++;
|
|
}
|
|
if (nch!=_EOF_) {
|
|
_UNGETC_(nch, file);
|
|
}
|
|
TRACE("returning %d\n", rd);
|
|
return rd;
|
|
}
|
|
|
|
#undef _CHAR_
|
|
#undef _EOF_
|
|
#undef _EOF_RET
|
|
#undef _ISSPACE_
|
|
#undef _ISDIGIT_
|
|
#undef _CHAR2SUPPORTED_
|
|
#undef _WIDE2SUPPORTED_
|
|
#undef _CHAR2DIGIT_
|
|
#undef _GETC_
|
|
#undef _UNGETC_
|
|
#undef _FUNCTION_
|
|
#undef _BITMAPSIZE_
|